# Draft California 2012 Integrated Report( 303(d) List/305(b) Report)

# Supporting Information

## Regional Board 6 - Lahontan Region

Water Body Name: | Snowshoe Thompson Ditch 1
Water Body ID: | CAR6331001220110223171750
Water Body Type: | River & Stream

DECISION ID | 32266 | Region 6
Snowshoe Thompson Ditch 1

Pollutant: | Nitrate
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | New Decision
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of three samples exceeded the tributary rule objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Staff Decision Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 32266, Nitrate | Region 6
Snowshoe Thompson Ditch 1
LOE ID: | 31695
Pollutant: | Nitrate
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 3
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero out of three annual means of monthly means exceeded the water quality objective for nitrate as nitrogen expressed as an annual mean of monthly means. A total of 6 samples were collected from the three sites.
Data Reference: | Data for temperature, nutrients, and bacteria in Heavenly Valley Creek (USFS boundary to Trout Creek) and various water bodies in Alpine County, Jul 1980-Jun. 2010
SWAMP Data: | Non-SWAMP
Water Quality Objective/Criterion: | The site specific objective for West Fork Carson River at Woodfords for nitrate as nitrogen is is 0.02 mg/L as means of monthly means. This site-specific objective is applied according to the "tributary rule" as outlined in the Lahontan Water Board Basin Plan.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected at three sites: Snowshoe Ditch @ Dressler Ditch, Snowshoe Ditch #1 @ Millich Diversion and Snowshoe Ditch #1 @ Proposed Pipe end.
Temporal Representation: | Samples were collected in 2000 and 2005.
Environmental Conditions: |
QAPP Information: | Samples were collected by STPUD and analyzed using STPUD Laboratory quality assurance program
QAPP Information Reference(s):

DECISION ID | 32267 | Region 6
Snowshoe Thompson Ditch 1

Pollutant: | Nitrite
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | New Decision
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of six samples exceeded the tributary rule objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Staff Decision Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 32267, Nitrite | Region 6
Snowshoe Thompson Ditch 1
LOE ID: | 31694
Pollutant: | Nitrite
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 6
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero out of six samples collected exceeded the water quality objective for nitrite.
Data Reference: | Data for temperature, nutrients, and bacteria in Heavenly Valley Creek (USFS boundary to Trout Creek) and various water bodies in Alpine County, Jul 1980-Jun. 2010
SWAMP Data: | Non-SWAMP
Water Quality Objective/Criterion: | The Water Quality Control Plan, Lahontan Basin, Objective for Municipal and Domestic Supply uses of inland surface waters states the following: waters shall not contain concentrations of inorganic chemicals in excess of the limits specified in California Code of Regulations, Title 22, Table 64431-A of section 64431 (Inorganic Chemicals). The maximum contaminant level listed in Table 64431-A for nitrite is 1.0 mg/L.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected at three sites: Snowshoe Ditch @ Dressler Ditch, Snowshoe Ditch #1 @ Millich Diversion and Snowshoe Ditch #1 @ Proposed Pipe end.
Temporal Representation: | Samples were collected in 2000 and 2005.
Environmental Conditions: |
QAPP Information: | Samples were collected by STPUD and analyzed using STPUD Laboratory quality assurance program
QAPP Information Reference(s):

DECISION ID | 32268 | Region 6
Snowshoe Thompson Ditch 1

Pollutant: | Nitrogen, ammonia (Total Ammonia)
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | New Decision
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One lines of evidence are available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of three samples exceeded the tributary rule objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Staff Decision Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 32268, Nitrogen, ammonia (Total Ammonia) | Region 6
Snowshoe Thompson Ditch 1
LOE ID: | 31693
Pollutant: | Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 3
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero out of the three averaged samples exceeded the water quality objective for un-ionized ammonia. A total of 5 ammonia samples were collected.
Data Reference: | Data for temperature, nutrients, and bacteria in Heavenly Valley Creek (USFS boundary to Trout Creek) and various water bodies in Alpine County, Jul 1980-Jun. 2010
SWAMP Data: | Non-SWAMP
Water Quality Objective/Criterion: | The Lahontan Basin Plan objective for un-ionized ammonia is a function of pH, temperature, and the presence of salmonids.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected at three sites: Snowshoe Ditch @ Dressler Ditch, Snowshoe Ditch #1 @ Millich Diversion and Snowshoe Ditch #1 @ Proposed Pipe end.
Temporal Representation: | The sample at Snowshoe Ditch @ Dressler Ditch was collected on 6/1/2000. Samples at Snowshoe Ditch #1 @ Millich Diversion and Snowshoe Ditch #1 @ Proposed Pipe end were collected on 5/31/2005 and 6/1/2005.
Environmental Conditions: |
QAPP Information: | Samples were collected by STPUD and analyzed using STPUD Laboratory quality assurance program
QAPP Information Reference(s):

DECISION ID | 32270 | Region 6
Snowshoe Thompson Ditch 1

Pollutant: | Temperature, water
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | New Decision
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of eight samples exceeded the tributary rule objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Staff Decision Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 32270, Temperature, water | Region 6
Snowshoe Thompson Ditch 1
LOE ID: | 31709
Pollutant: | Temperature, water
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 8
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | None of the 8 samples exceeded the evaluation guideline for temperature in this water body.
Data Reference: | Data for temperature, nutrients, and bacteria in Heavenly Valley Creek (USFS boundary to Trout Creek) and various water bodies in Alpine County, Jul 1980-Jun. 2010
SWAMP Data: | Non-SWAMP
Water Quality Objective/Criterion: | The natural receiving water temperature of all waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Board that such an alteration in temperature does not adversely affect the water for beneficial uses. For waters designated WARM, water temperature shall not be altered by more than five degrees Fahrenheit above or below the natural temperature. For waters designated COLD, the temperature shall not be altered.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: | Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Guideline Reference: | Fish introductions in CA: History and impact on native fishes. Davis, CA: University of CA, Davis
Spatial Representation: | Samples were collected at the following locations in this water body: Snowshoe Ditch @ Dressler Ditch Snowshoe Ditch #1 @ Millich Diversion Snowshoe Ditch #1 @ Proposed Pipe end
Temporal Representation: | Samples collected during the years 2000 and 2005.
Environmental Conditions: |
QAPP Information: | South Tahoe Public Utility District Laboratory Quality Assurance Program by Terry Powers, Laboratory Director (March 30, 2009)
QAPP Information Reference(s):

DECISION ID | 32272 | Region 6
Snowshoe Thompson Ditch 1

Pollutant: | pH
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | New Decision
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of 12 samples exceeded the tributary rule objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Staff Decision Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 32272, pH | Region 6
Snowshoe Thompson Ditch 1
LOE ID: | 34071
Pollutant: | pH
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 12
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Numeric data generated from 12 minimums and maximums of pH data had no exceedences.
Data Reference: | Data for temperature, nutrients, and bacteria in Heavenly Valley Creek (USFS boundary to Trout Creek) and various water bodies in Alpine County, Jul 1980-Jun. 2010
SWAMP Data: | Non-SWAMP
Water Quality Objective/Criterion: | In fresh waters with designated beneficial uses of COLD or WARM, changes in normal ambient pH levels shall not exceed 0.5 pH units. For all other waters of the Region, the pH shall not be depressed below 6.5 nor raised above 8.5. The Regional Board recognizes that some waters of the Region may have natural pH levels outside of the 6.5 to 8.5 range. Compliance with the pH objective for these waters will be determined on a case-by-case basis. [There is no site specific objective for pH for this water body]
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected from the the D-2, D-5, and D-6 stations.
Temporal Representation: | Samples were collected twice a month in May and June 2000 and April through June 2005.
Environmental Conditions: |
QAPP Information: | SWAMP QAPP
QAPP Information Reference(s): | Surface Water Ambient Monitoring Program Quality Assurance Program Plan

DECISION ID | 32269 | Region 6
Snowshoe Thompson Ditch 1

Pollutant: | Phosphorus
Final Listing Decision: | List on 303(d) list (being addressed by action other than TMDL)
Last Listing Cycle's Final Listing Decision: | New Decision
Revision Status | Revised
Sources: | Source Unknown
Expected Attainment Date: | 2025
Date TMDL Approved by USEPA: | This is a ditch that is tributary of the W. Fork Carson River. Under BOARD ORDER NO. R6T-2004-0010 WDID NO. 6A095900700, which regulates recycled waterwater, prohibits STPUD from discharging any deleterious material to the W. Fork the Carson River. STPUD is not required to sample this ditch as part of their permit, but are required to sample the receiving water. Any impairments to the ditch are addressed by the permit in lieu of a TMDL. According to the permit, STPUD is required to sample SW-01 (W. Fork Carson River at lower end of Crystal Springs Rd.) and SW-02 (Indian Creek 100 yards above diversion) monthly (March-November) for TP. These sampling locations show water quality upstream and downstream of Snowshoe Thompson ditch. In section XII, A, "For every item where the requirements are not met, the discharger shall submit a statement of the actions undertaken or proposed which will bring the discharge into full compliance with requirements at the earliest time, and shall submit a timetable for correction."
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Three of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Three of three samples exceeded the tributary rule objective and this does exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. REGIONAL BOARD rational for being addressed by an action other than a TMDL: This is a ditch that is tributary to the W. Fork Carson River. Under BOARD ORDER NO. R6T-2004-0010 WDID NO. 6A095900700, STPUD is prohibited from discharging any deleterious material to the W. Fork the Carson River. STPUD is not required to sample this ditch as part of their permit, but are required to sample the receiving water. Any impairments to the ditch are addressed by the permit in lieu of a TMDL. According to the permit, STPUD is required to sample SW-01 (W. Fork Carson River at lower end of Crystal Springs Rd.) and SW-02 (Indian Creek 100 yards above diversion) monthly (March-November) for TP. These sampling locations show water quality upstream and downstream of Snowshoe Thompson ditch. In section XII, A, "For every item where the requirements are not met, the discharger shall submit a statement of the actions undertaken or proposed which will bring the discharge into full compliance with requirements at the earliest time, and shall submit a timetable for correction."
Regional Board Staff Decision Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable tributary rule water quality standards are exceeded. The irrigation ditch is considered and evaluated as a surface water because flows within the ditch originate from West Fork of the Carson River in the headwaters to Woodfords segment of the river and flow into Indian Creek.

Line of Evidence (LOE) for Decision ID 32269, Phosphorus | Region 6
Snowshoe Thompson Ditch 1
LOE ID: | 31697
Pollutant: | Phosphorus
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 3
Number of Exceedances: | 3
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Three out of three annual means of monthly means exceeded the water quality objective for total phosphorus expressed as an annual mean of monthly means. A total of eight samples were collected from the three sites.
Data Reference: | Data for temperature, nutrients, and bacteria in Heavenly Valley Creek (USFS boundary to Trout Creek) and various water bodies in Alpine County, Jul 1980-Jun. 2010
SWAMP Data: | Non-SWAMP
Water Quality Objective/Criterion: | The site specific objective for West Fork Carson River at Woodfords for total phosphorus is 0.02 mg/L as means of monthly means. This site-specific objective is applied according to the "tributary rule" as outlined in the Lahontan Water Board Basin Plan.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Two samples each were collected at Snowshoe Ditch #1 @ Millich Diversion and Snowshoe Ditch #1 @ Proposed Pipe end. Four samples were collected at Snowshoe Ditch @ Dressler Ditch.
Temporal Representation: | Samples at Snowshoe Ditch @ Dressler Ditch were collected in May and June of 2000. Samples collected at Snowshoe Ditch #1 @ Millich Diversion and Snowshoe Ditch #1 @ Proposed Pipe end were collected in April, May, and June of 2005.
Environmental Conditions: |
QAPP Information: | Samples were collected by STPUD and analyzed using STPUD Laboratory quality assurance program.
QAPP Information Reference(s):

DECISION ID | 32271 | Region 6
Snowshoe Thompson Ditch 1

Pollutant: | Total Kjeldahl Nitrogen (TKN)
Final Listing Decision: | List on 303(d) list (being addressed by action other than TMDL)
Last Listing Cycle's Final Listing Decision: | New Decision
Revision Status | Revised
Sources: | Source Unknown
Expected Attainment Date: | 2025
Date TMDL Approved by USEPA: | This is a ditch that is tributary to the W. Fork Carson River. Under BOARD ORDER NO. R6T-2004-0010 WDID NO. 6A095900700, which regulates recycled waterwater, prohibits STPUD from discharging any deleterious material to the W. Fork the Carson River. STPUD is not required to sample this ditch as part of their permit, but are required to sample the receiving water. Any impairments to the ditch are addressed by the permit in lieu of a TMDL. According to the permit, STPUD is required to sample SW-01 (W. Fork Carson River at lower end of Crystal Springs Rd.) and SW-02 (Indian Creek 100 yards above diversion) monthly (March-November) for TKN. These sampling locations show water quality upstream and downstream of Snowshoe Thompson ditch. In section XII, A, "For every item where the requirements are not met, the discharger shall submit a statement of the actions undertaken or proposed which will bring the discharge into full compliance with requirements at the earliest time, and shall submit a timetable for correction."
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Three of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Three of three samples exceed the tributary rule objective and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. REGIONAL BOARD rationale for being addressed by an action other than a TMDL: This is a ditch that is tributary to the W. Fork Carson River. Under BOARD ORDER NO. R6T-2004-0010 WDID NO. 6A095900700, STPUD is prohibited from discharging any deleterious material to the W. Fork the Carson River. STPUD is not required to sample this ditch as part of their permit, but are required to sample the receiving water. Any impairments to the ditch are addressed by the permit in lieu of a TMDL. According to the permit, STPUD is required to sample SW-01 (W. Fork Carson River at lower end of Crystal Springs Rd.) and SW-02 (Indian Creek 100 yards above diversion) monthly (March-November) for TKN. These sampling locations show water quality upstream and downstream of Snowshoe Thompson ditch. In section XII, A, "For every item where the requirements are not met, the discharger shall submit a statement of the actions undertaken or proposed which will bring the discharge into full compliance with requirements at the earliest time, and shall submit a timetable for correction."
Regional Board Staff Decision Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable tributary rule water quality standards are exceeded and a pollutant contributes to or causes the problem. The irrigation ditch is considered and evaluated as a surface water because flows within the ditch originate from West Fork of the Carson River in the headwaters to Woodfords segment of the river and flow into Indian Creek.

Line of Evidence (LOE) for Decision ID 32271, Total Kjeldahl Nitrogen (TKN) | Region 6
Snowshoe Thompson Ditch 1
LOE ID: | 31696
Pollutant: | Total Kjeldahl Nitrogen (TKN)
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 3
Number of Exceedances: | 3
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Three out of three annual means of monthly means exceeded the water quality objective for Total Kjeldahl Nitrogen expressed as an annual mean of monthly means. A total of five samples were collected from the three sites.
Data Reference: | Data for temperature, nutrients, and bacteria in Heavenly Valley Creek (USFS boundary to Trout Creek) and various water bodies in Alpine County, Jul 1980-Jun. 2010
SWAMP Data: | Non-SWAMP
Water Quality Objective/Criterion: | The site specific objective for West Fork Carson River at Woodfords for Total Kjeldahl Nitrogen is 0.13 mg/L as means of monthly means. This site-specific objective is applied according to the "tributary rule" as outlined in the Lahontan Water Board Basin Plan.
Objective/Criterion Reference: | Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected at three sites: Snowshoe Ditch @ Dressler Ditch, Snowshoe Ditch #1 @ Millich Diversion and Snowshoe Ditch #1 @ Proposed Pipe end.
Temporal Representation: | Samples were collected in 2000 and 2005.
Environmental Conditions: |
QAPP Information: | Samples were collected by STPUD and analyzed using STPUD Laboratory quality assurance program
QAPP Information Reference(s):